It can, though, because of the +/-1 variation for some classes and because tier and tank class are treated independently by the mm. You can have a tier 9 TD and a tier 10 TD on the other team, or a single tier 10 HT on a team and no HT at all on the other.

edit: I'll get you replays at normal times. Later today, I'll play a couple matches with that in mind.

It can but it's pretty rare, and i honestly don't think that a fluke like that is a problem. Since 3-5-7 hit the servers i have seen maybe 10 times at best at popular hours those kind of mismatches. The template systems is the problem, because it forces above all the 3-5-7 template.